文献类型：期刊文献

中文题名：不同载气供料对工业级竖直上升管粉煤气力输送的影响

英文题名：Effect of feeding gas on pneumatic conveying of pulverized coal in industrial-scale vertical pipe

作者：潘响明[1];郭晓镭[1];陆海峰[1];刘剀[1];付琳[1];李鹏[1];龚欣[1]

机构：[1]华东理工大学煤气化及能源化工教育部重点实验室,上海市煤气化工程技术研究中心,上海200237

年份：2016

卷号：67

期号：4

起止页码：1169

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：CSTPCD;;EI(收录号：20161902356039);Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：国家自然科学基金项目(21206041)

语种：中文

中文关键词：载气切换;稳定性;CO_(2);气力输送;ECT

外文关键词：gas switching;stability;CO_(2);pneumatic conveying;ECT

摘要：采用Air和CO_(2)作为供料和输送载气,以工业级竖直上升管(内径50 mm)粉煤输送系统为实验平台,开展了粉煤密相气力输送实验研究。实验中选用Air→Air、Air→CO_(2)、CO_(2)→Air和CO_(2)→CO_(2)作为典型工况,进行了输送特性参数的对比分析。研究结果表明,供料载气与输送载气组合方式的变化,会引起发料罐中粉煤流化状态的改变,进而导致粉煤输送流型和稳定性方面的差异。借助电容层析成像系统(ECT)获得了竖直管的ECT信号和流型图像,并采用标准差和功率谱函数对ECT信号进行分析。分析结果表明,Air→Air工况为稳定的环状流;Air→CO_(2)输送过程稳定性最差,输送由无定态流型转为栓塞流;CO_(2)→Air和CO_(2)→CO_(2)输送过程均为气栓流,但CO_(2)→CO_(2)工况形成的气栓较长,其ECT信号的功率谱峰值较大。
The dense-phase pneumatic conveying of pulverized coal was investigated in an industrial-scale vertical pipe(50 mm I.D.).Air and CO_(2)was used as feeding gas or carrying gas,which consequently forms four typical cases,namely Air→Air,Air→CO_(2),CO_(2)→Air and CO_(2)→CO_(2).Comparison was conducted between the above cases to analyze the conveying characteristics of pulverized coal experienced different courses.The results showed that the compound modes of feeding gas and carrying gas could affect the fluidized state of pulverized coal in the feeder vessel and result in the differences of stability and flow patterns of conveying process.Electrical capacitance tomography(ECT)was employed to monitor the flow patterns,while the solid concentration signals obtained from ECT were analyzed on the basis of standard deviation(SD)function and power spectral density(PSD)function.It was concluded that the flow pattern of pulverized coal in the case of Air→Air was a stable annular flow,and the stability of the case of Air→CO_(2)was the worst in which the flow pattern changed from a stable flow to slug flow.Both cases of CO_(2)→Air and CO_(2)→CO_(2)performed plug flow.In comparison,in the case of CO_(2)→CO_(2),the bigger plug and higher peak value of PSD were obtained.